Using Variables and Declaring Constants in C++

By Siddhartha Rao
Feb 2, 2022

📄 Contents

␡

What Is a Variable?
Common Compiler-Supported C++ Variable Types
Determining the Size of a Variable by Using sizeof()
Automatic Type Inference Using auto
Using typedef to Substitute a Variable’s Type
What Is a Constant?
Keywords You Cannot Use as Variable or Constant Names
Summary
Q&A
Workshop

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Using `typedef` to Substitute a Variable’s Type

C++ enables you to substitute variable types with something that you might find convenient. You use the keyword typedef for that. Here is an example where a programmer wants to call an unsigned int a descriptive STRICTLY_POSITIVE_INTEGER:

typedef unsigned int STRICTLY_POSITIVE_INTEGER;
STRICTLY_POSITIVE_INTEGER numEggsInBasket = 45;

When this code is compiled, the first line tells the compiler that a STRICTLY_POSITIVE_INTEGER is nothing but an unsigned int. At later stages, when the compiler encounters the already defined type STRICTLY_POSITIVE_INTEGER, it substitutes it for unsigned int and continues compilation.

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